When an optically active aldopentose A was subjected to the decarbonylation reaction in Problem 24.47, an optically

Question:

When an optically active aldopentose A was subjected to the decarbonylation reaction in Problem 24.47, an optically inactive product B was obtained. When al-dopentose A was subjected to the Kiliani-Fischer syn-thesis, two aldoses C and D were obtained. Treatment of C and D with HNO3 gave optically active aldaric acids E and F. respectively. Identify compounds A-E.I